We use CF9.01 on 64bit Linux with JRun4 and Apache, with the included JRE 1.6.17 or so. I have not found Adobe's published list of approved Java versions for each platform, but can we upgrade to a Java 7 SDK for instance?
Given that we are also experiencing 'Server Busy, Too many concurrent requests' error that we have trouble eradicating, would getting rid of JRun and moving to TomCat be a wise thing to do?